Continuous furnace for burning cement and the like



R; THIELE coNTINuous FURNACE FOR BURNING CEMENT AND THE LIKE Apr} 10, 192B.

2 shets-sheet 1 Filed Aug 12, 1916 Apr. 10, 1923.

R. THlELE CONTINUOUS FURNACE FOR BURNING CEMENT AND THE LIKE Filed Aug 12, 1916; 2 sheets-sheet 2 a I 1 2 .61: m3.

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- 50 sections or h Patented Apr. 1c, 1923.

RUDOLF'TEIELE, or ox'rER-oN-TnE-wEsEn, GERMANY.

@B N E W MHE PROVISIQNS O i ACT a ian e .3, 1921, 41.51 313.

To allwhom it may concern:

Be it known that I, RU OLF TI-IIELE, subject ofthe King of=-Pr11ssia', and resident ofHoxter-n-the-NVeser, in the Kingdomof .5 Prussia, Empireoi Germany, head manager, :have invented certain new and useful,

Improvements in f (lontinuous Furnaces i'ior Burning Cement and the like (for which. ap-

plications have been filed in Germany, May 22, 19.15, Patent No. 293,284; .Germany, April'7, 1916, Patent 110.297,?53;riustria, April25,=19 16, Patent No. 86,191 Switzei landyMa'y 10, 1916, PatentNo. 73,899; Denmark, May12, 1916, Patent No. 22,066; Norway,-l\1ay 15, 1916, Patent No. 28,155 ;:Swe

den, 'May 15, 1916 Patent No. 11,972,1-1mt gary, =May "17, 1916, Patent No. 70,350; France, May 23, 1916, Patent No. 512,991; England, May 30, 19.16',"Patent No. 101,937;

20 Belgium, June' 13, -1916,Patent No. 271,211

Italy, June 2 1, 1916, Patent No. 507/1170- 154,673; Turkey, July 5, 1916,: Patent No.

i 2,632; Spain,@ctober 18,1916, Patent NQ.

63,133 ;-L uxem burg, October 2 1, 1919, Patent 190, 11,533 Poland, November 11, 1919, no patentissued as yet; Roumania,June 6/19, 1916, no patent issued as yet; Czechoslovakia, January 25, 1922, Patent No/8,177; Czechoslovakia, March 16, 1922, no patent issuedas yet), Qfwhichthe following is a specification. a

Mypresent invention relatesto'the class of furnaces in which more Or less'intensely baking' materials for the manufacture o-fceinent and the like are; burnt in acontinuous ope'r ation, but more particularly to a crushingnd delivering-device; thereof.

- The object of my invention isto replace the stationary grate forming the bottom of 40 such furnaces by a 'reciprocatingshearinggrate,-by the'aidof which the burntmaterials may be-not only comminutedbut also delivered. Since the Weight continuously to'besupported by the grateof such'ffurnaces is'exceeding'lfy great,

ciprocate it must of necesslty be great ito o and -i :'or this reason would, if applied one sideonly, endanger the furnace. To successfully ayoid this 1 build the grate up of two lves,place these side side andapply-to each of them one half'offlthe operative force in such a nan'nenthat the two sections, forming practically ,a s ngle horizontal grate,f,are s multaneously oper- 1 awe-in opposite directionsfin theplane of the force tore said grate; Indoing so the detrimental-actions of the operative force's upon the structure of the furnace arewholly ayoidedt To facilitate the shearing action of the signed tO- IIICE'GELSQthG ShQflIlllg-fiCtlOIl thereof will -be duly pointed out in the specification and claimed in theappen'de'd claiinsfi" I Sincethe operative "forces are necessarily great, the driving-rods coupling the mechanism with ,said grate-sections must be carefully protected against fiexure iaruibind,- ing, To attain. this I hingetoeach section astout lriVing-rod an'dgiiide the external ends of {these rods "by [cross-heads so at th y are je ed it teii i l arid pressure only. vThe cross-headslare connected by ec n -r iw fa d iib -jc w re kss tj t driving-mechanism hay ng 1ts v Q MQ 1 lS he ab r 180 to, each other. named a a n w re the advantage thatin a e h re enrle as 'is mp si sfl th d l e p19 ,c ta ii 'gth l l efihe grate can be easilyfkept air-tight. "To ,ale-

complish this I lose the aperturesthi which sm 'd ivi em nter Sa eateryh rp y mea b -twb p ti d stuffii e b e h acki g ,o whi is kept niwntee i with t e si i g-fr d byfthe agen y o p i -P sse stufiel ii ctiqns' i In the accompanying drawings Figure 1 is a Vertical sectionalviewof a e i iltina cor an i hmyrresest invention, l e Figure 2 ishoriZontal sectional yiewtalren on line A..B 0f eurerlawhe ee a a l view mammo iailar l we The urnin rehambe ll o "th inm te is c pp y theho d n 1 $da its o n a ,she rie erete 1G lower e d y e 'arranged'above the delivery-hopper 3. (Tillie grate G i ensistfs o the tWqg-xatase tirn I ands. By arranging in each grate-sect on the grate-bars 6 .at right angles, end the m mb rs Te a a ut an to the di eciQ -u ;tl l isxetem tipnr rhom e eve n s .8 l bta n d- 1 cross-heads of both *tions 44 upon guide-pins 44 of the shafti23- meshes against two adjacent sides of ed on a heavy base 9 provided with runners 10 which are supported by rollers 11 to reduce friction. At each end of the runners 10 a ribbed shearing-plate 12 is arranged and provided with a plurality of holes 12 of considerably less varea than the grateopenings 8. Besides this each shearingplate 12 is armed with a plurality of diamond-shaped teeth or projections 13 to increase the shearing and crushing capacity ofsaid plates. In a similar manner and for the same reason the grate-bars 6 and 7 are armed with teeth 14. Betweenthe runners 10 of each grate-section a cross-piece 15 is secured towhich the inner end of a heavy driving-rod 16 is suitably hinged. The outer end of each drivingrod passes outwards through an opening 17 of the furnace-wall and is provided with a cross-head 18 guided by the guide-bars 19 and 20. ,The

driving-rods are connected with the cranks 21 and 22 of the driving-shaft 23 by means of connectingrods 24. The cranks 21 and 22 are set at 180 to each other to compel vthe gratesections 4 and 5 to reciprocate simultaneously in opposite directions. The worm-wheel 25 with the worm 26 of the shaft 27 which by means of thewormwheel '28 and the worm 29 receives its mo tion from the shaft 30. The shafts 23 and 27 are suitably journaled on the rigidly braced frame-Work 31. The shaft 30, supported'on the floor 32, carries a pulley 33 which is connected by a belt 34, chain or the like with a pulley 35 of the shaft 36 journaled. in hangers 37 arranged beneath said floor. The shaft 36 receives its motion from an electric motor M which transmits its rotary motion to the pulley 38 of shaft 36 by the aid of a belt 39.

To prevent the blast-air from escaping from the delivery-hopper 3 through the wallopenings 17 a two-part stufling-box 40 is provided for each driving-rod 16. Each of these stuffing-boxes consists of two flanged sections which are slidingly attached to a wall-plate 41 and subjected to the action of springs 42 arranged between the stufiingoX-sections 43 and the wall-plate-projecof the latter. The cups 43 are in this instance angular in shape to agree with the rectangular crosssection of the driving-rods .16. The springs 42 are arranged diagonally to'said drivingrods to simultaneously press both wings of the packing 45 of each stufiing-boX-division said drivingrods. g

The operation of said furnace is as fol lows I I The suitable mixture of fuel and raw material for the formation of cement-clinkers orof aclinker-stock is introduced into the burning chamber 1 through the openings 46 of the hood 2 and the blast-air is introduced by any suitable known means (not shown) into the delivery-hopper 3. After a clinkerstock has been formed both grate-sections are set in motion which, according to the ratio of power-transmission shown, will be comparatively slow. The toothed bars and plates of both grate-sections will now attack from opposite" sides the clinker-stock produced by the baking and sintering action of the fuel upon the raw material. The clinkerstock will during the ensuing ('rushin and shearing-process be held in equilibrium and therefore be prevented from endangering the furnace-structure. The shearing and crushing action of the grate-sections exerted hereby upon the lower end'of the clinkerstock will gradually comminute the latter and the fragments resulting therefrom will, if sufficiently reduced, drop through the openings 8 and 12 into the delivery-hopper 3. If still too larg to pass through said openings they will be retained by the gratesections until reduced to the requiredsize. It is evident that coarse and exceptionally hard burnt clinker-fragments would be apt to cause the partial or entire destruction of the driving-gear if they shouldfind an opportunity to form arigid obstacle between the one or the other grate-section and the furnace-wall before the corresponding gratesection could finish its stroke. Opportunities of this kind may, of course, present themselves as often as a clinker-fragment of the kind pointed out above partially enters into a grate-opening 8 and partially projects above the surface of the grate. Such possibilities can, however, be fully excluded by giving each of the shearing-plates 12 a width which must at least equal but may be greater than the stroke of the grate-sections, i. e. the distance to which said sections move back and forth in the pockets formed by the I-beams 47 at the upper part of the deliveryhopper 3. To successfully prevent coarse clinker-fragments from finding a suflicientl sure footing on said plates to enable them to act asdangerous obstacles, the holes 12 of the plates 12 are, as already stated before, of considerably less area than the openings 8 By this arrangement the drivinggear is fully protected against destruction carries at the one end a weight 54 and at the other a toothed guide-bar 55' which is arranged in a bracket 56 in such a manner that during each revolution of the shaft 57 each sluice-gate can be raised by meanszof a "crank 58 of said shaft and .be returned again to its initial positionby its own weight 54. The rotation of the shaft 57 is caused by the shaft '27, the intermediate shaft 59 and the belts 60 and 61. The" speed of the shaft 59 remains'constant, whereas the speed of the shaft 57 may be varied by shiftlng the belt '61 on thestep'pedcones62 and 63. The cranks 58 are set at 180 to each other to permit ofthe opening and closing of the sluice-gate 49 while-the sluicegate 50 remains closed, and vice versa. In

.operation the clinkerfragments sliding down the channel 48 will, when. the gate 49 is opened and the gate 50 shut,,advance into the space lying between both gates until the gate 49 is closed. The clinker-fragments thus entrapped will, however, leave this space and the lower end of said channel when'in due time th gate 50 will be opened.

The closing of this gate will take place be-, can be opened anew. In

fore the gate 49 this manner-the pressure of the blast-air within the delivery-hopper 3 will be kept practically constant. Iclaim:- '7 1. A continuous furnace of the character described, having a shearing-grate consisting of grate-sections adapted to be reciprocated in their own plane in opposite directions to each other, clinker-crushing teeth on said sections and means for reciprocating said rate-sections.

1 ing of two grate-sections adapted to be si-- 2. A continuous furnace of the character described, having a shearing-grate consistmultaneously reciprocated in opposite directions in the plane of said shearing-grate, clinker-crushing teeth onsaid sections and means for simultaneously reciprocating said grate-sections.

3. A continuous furnace Of thQ' character described,v comprising a shearing grate, consisting of two ing-frame and adapted to besimultaneously grate-sections having their grate-bars combined to form a lattice-shear- 4. A continuous furnace of the character described, having a shearing-grate consistmg of grate sections reciprocatable in opposite directions, said grate-sections comprising each a centrally arranged lattice-shearframe and two perforated shearing-plates arranged atthe ends of said grate-sections; and means for simultaneously reciprocatingsaid grate-sections. 5; A-continuous furnace of the character described, having a shearing-grate composed of two grate sections adaptedto be simultaneously reciprocated in the plane of said grate, said grate-sections being each provided with a centrallyarranged latticeshearing-frame formed by teeth-studded grate-bars and provided further with perforated shearing-platesarranged adjacent the ends of said lattice-shearingefram'e and furnished with shearing-teeth; and means for simultaneously reciprocating said grate-sea, tions,

' 6. A continuous furnace of the character described, having a shearing-grate composed of two grate-sections adapted to be simultaneously reciprocated in opposite directions in'the plane of said shearing-grate; said grate-sections being each equipped with a centrally arranged lattice-shearingframe" composed of one set ofteeth-studded grate-bars arranged at right angles to the direction of the grate-motion and of another set of teeth-studded grate-bars arranged at an acute angle thereto, and equipped also with two shearingplates equalling in width at least the stroke of said grate-sections and provided with openings of less area then the openings of said latticeshearing-frame and further provided with diamond-shaped shearing-teeth having their.

grate-motion; and means for simultaneously reciprocating said grate-sections.

Signed y meat Hanover, Germany, at

this 7th day of April, 1916.

a V RUDOL THIELE. Witnessesz. i

. B. MICHAELIS,

M. BEHNE.

longer diagonal pointing in the directionof lOO 

